JP2863704B2 - Multi-channel mobile radio repeater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay apparatus for performing relay without converting a frequency in a mobile radio line of a multi-channel two-frequency duplex system. The present invention relates to a multi-channel mobile wireless relay device that enables communication between an area and a location without increasing wireless allocation.

[0002]

2. Description of the Related Art Conventionally, in a mobile radio system in a VHF band or a UHF band, a relay device for amplifying and relaying a high frequency channel of a base station as it is has been implemented in a road tunnel or the like.

[0003] The conventional relay device relays the entire band including the up frequency and the down frequency collectively, so that it is easy to relay an unnecessary wave which is not intended. Interference waves due to unnecessary waves generated by the above are easily generated. For this reason, it was not economically possible to increase the transmission output for the service area, and it was difficult to service a large mobile communication area.

[0004]

The relay device converts the frequency because the antenna for transmitting and receiving radio waves to and from the master station and the antenna for transmitting and receiving radio waves to and from the mobile station are arranged at a short distance. In the case of using a method of performing relaying without using, there is a problem that coupling between input and output is relatively large, and abnormal oscillation is likely to occur.

[0005] Further, the conventional repeater is configured so that an amplifier for amplifying each wireless communication channel to required power amplifies a predetermined band at a time. It is used exclusively to cover small enclosed space areas such as tunnels due to limitations. Also, to relay and amplify all radio waves in the band,
An unintended radio wave may be relayed, and interference may occur in a communication channel due to a distorted wave component generated by the influence of a strong radio wave in a further adjacent band.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and significantly reduces the coupling between input and output to reliably prevent abnormal oscillation. It is an object of the present invention to provide a multi-channel mobile radio relay device that can selectively relay, suppresses relay of unintended radio waves and emission of unnecessary waves, and enables a wide range of communication services.

[0007]

According to a first aspect of the present invention, there is provided a relay apparatus for performing relay without converting a frequency in a mobile radio line of a multi-channel two-frequency duplex system for transmitting and receiving radio waves to and from a master station. A parent antenna, an area antenna that transmits and receives radio waves to and from the mobile station, a bidirectional relay amplifier that is provided between the parent antenna and the area antenna and amplifies a transmission / reception signal, A first sensor antenna provided in proximity to the antenna;
A second sensor antenna provided in proximity to the area antenna; and a radio wave radiated from the area antenna and the second sensor antenna received by the parent antenna and the first sensor antenna are level-adjusted and inverted. First coupling means for phase-combining and coupling to the relay amplifier; and adjusting the level of radiated radio waves from the parent antenna and the first sensor antenna received by the area antenna and the second sensor antenna, and vice versa. Second coupling means for phase-combining and coupling to the relay amplifier.

According to a second aspect of the present invention, there is provided a relay apparatus for performing relay without converting a frequency in a mobile radio circuit of a multi-channel two-frequency duplex system, wherein a plurality of high-frequency communication channels required for each direction of relay are narrowed by a plurality of narrow channels. Each of the separated outputs is amplified by a separate dedicated amplifier, and the output of each amplifier is combined by a narrow-band filter-type combiner. It is characterized by a bidirectional configuration.

[0009]

[Action]

(First Invention) A radio wave fd for a mobile station radiated from the master station into the air is received by a master antenna of the relay device, amplified by a relay amplifier, and transmitted to the mobile station from an area antenna. In addition, radio waves fu for the master station from the mobile station.
Follows the reverse route and is reported to the master station.

The radio wave fd for the mobile station relayed by the relay device is radiated from the front of the area antenna, but is also attenuated from behind. Further, the radio wave fd for the mobile station is also radiated from the second sensor antenna. The radio wave fd for the mobile station radiated from the area antenna and the second sensor antenna is received by the master station antenna and is transmitted to the first station antenna.
Is received by the sensor antenna. The radio wave fd received by the parent antenna and the first sensor antenna is:
After the level is adjusted by the first coupling means, the signals are subjected to reverse-phase synthesis and undergo significant attenuation.

The radio wave fu for the master station from the mobile station relayed by the relay apparatus is radiated from the antenna for the master toward the master station, but also radiated from behind the same as in the above case. . Then, those radiated from the parent antenna and the first sensor antenna are received by the area antenna and the second sensor antenna, and are level-adjusted by the second coupling means. Receives attenuation.

As described above, the amount of coupling attenuation between the parent antenna and the area antenna is greatly improved, and abnormal oscillation due to coupling between the input and output of the repeater is suppressed.
It is possible to stably relay the same wave.

(Second invention) A relay device includes an amplifying device including a plurality of narrow band filters, a dedicated amplifier, and a narrow band filter type combiner, and narrows a high frequency channel that requires relay in a communication allocated band. The signal is split by a band-pass filter and selectively amplified for a plurality of communication channels.

The narrow band filter on the input side of the amplifying device has a function of preventing multi-frequency, which causes an increase in the intermodulation effect, from being input to the amplifier. The narrow band filter on the output side is generated by the intermodulation effect. Suppress unnecessary waves.

[0015] By the action of suppressing unnecessary waves due to this intermodulation, the maximum power of the amplifier output can be increased. For example, in the case where the amplification bandwidth is 100 kHz with respect to the used allocation frequency of 10 MHz, it is possible to obtain a power capability that is about 100 times that of the related art.

By increasing / decreasing the amplification level of the amplifier in accordance with the input level from the master station, it is possible to adjust the deviation of the loss between the master station and the relay point. Can be supplied.

[0017]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall system configuration diagram of a multi-channel mobile radio relay device according to one embodiment of the present invention.

In FIG. 1, 1 is a master station (base station), 2 is a relay device, and 3 is a mobile station mounted on a car or the like. The relay device 2 includes a parent antenna 11 using a parabolic antenna or the like for the master station 1 and an area antenna 12 using a corner antenna or the like for the mobile station 3. A first sensor antenna 13 and a second sensor antenna 14 are provided on the back surface so as to face each other. As the sensor antennas 13 and 14, use is made of an antenna having a very small gain and a good F / B (front / back) characteristic. The parent antenna 11 and the first sensor antenna 13 are connected to the bidirectional relay amplifier 16 via the coupler 15. When only the signal received by the parent antenna 11 is input, the coupler 15
Although the input signal is output to the relay amplifier 16 as it is, when the same radio wave is received by the parent antenna 11 and the first sensor antenna 13, the configuration is such that the reverse phase synthesis is performed to greatly attenuate. Details will be described later.

The area antenna 12 and the second sensor antenna 14 are connected to a relay amplifier 16 via a coupler 17. The coupler 17 includes the coupler 15
It has the same function as. The relay amplifier 16 is configured to be selectively amplified and synthesized by a plurality of narrow-band filter-added amplifiers, and details thereof will be described later. Further, a monitoring control interface 18 is connected to the relay amplifier 16, and the monitoring control interface 18
The terminal 19 is connected via a communication cable to a monitoring and control device (not shown) arranged at a monitoring center or the like.
This monitoring and control device performs monitoring and control of the relay device 2 and on / off control of the power supply.

In the above configuration, the radio wave fd radiated from the master station 1 into the air is transmitted to the antenna 11 for the master of the relay apparatus 2.
, And is amplified by the relay amplifier 16 via the coupler 15, supplied to the area antenna 12 via the coupler 17, and transmitted to the mobile station 3 from the area antenna 12.

The radio wave fu from the mobile station 3 follows the reverse route and is transmitted to the master station 1. That is, the radio wave fu from the mobile station 3 is received by the area antenna 12 of the relay device 2, amplified by the relay amplifier 16 via the coupler 17, and then supplied to the parent antenna 11 via the coupler 15.
The information is transmitted to the parent station 1 from the parent antenna 11.

The radio wave fd for the mobile station relayed by the relay device 2 is radiated from the front of the area antenna 12, but also attenuated from behind. Further, the radio wave fd for the mobile station is also radiated from the second sensor antenna 14 toward the parent antenna 11. The radio wave fd for the mobile station radiated backward from the area antenna 12 is received by the master station antenna 11 and received by the first sensor antenna 13. The radio waves fd received by the parent antenna 11 and the first sensor antenna 13 are adjusted in level by the coupler 15 and then subjected to the opposite-phase synthesis to be greatly attenuated. Further, the radio wave fd for the mobile station radiated from the second sensor antenna 14 is received by the master station antenna 11 and the first sensor antenna 1
After receiving the signal at 3 and adjusting the level at the coupler 15, the signal is subjected to reverse-phase synthesis and undergoes significant attenuation.

As described above, the radio waves radiated from the area antenna 12 and the second sensor antenna 14 toward the parent antenna 11 are transmitted to the parent antenna 11 and the first antenna 11.
Is received by the sensor antenna 13, but undergoes a large amount of attenuation in the opposite phase in the coupler 15, and is hardly input to the relay amplifier 16. As a result, the attenuation of the radio wave fd between the input and output of the relay amplifier 16 exceeds the amplifier gain, and the relay device 2 operates stably.

The radio wave fu for the master station relayed by the relay device 2 is radiated from the master antenna 11 to the master station 1, but leaks backward from the master antenna 11 in the same manner as described above. The signal radiated from the first sensor antenna 13 and the signal radiated from the first sensor antenna 13 are received by the area antenna 12 and the second sensor antenna 14, and the levels are adjusted by the coupler 17. The signal is hardly input to the relay amplifier 16. As a result, the relay device 2 performs a stable relay operation even with the radio wave fu.

FIG. 2 shows the configuration of the couplers 15 and 17. In FIG. 2, reference numeral 21 denotes a connection terminal of the main antenna (the parent antenna 11 or the area antenna 12), and reference numeral 22 denotes a connection terminal of the sensor antenna 13 or 14. Reference numeral 23 denotes a terminal to which the relay amplifier 16 is connected. Then, a coupling portion 24 is provided between the terminal 21 and the terminal 23. The high-frequency signal input to the terminal 22 is supplied to the attenuator 25 and the approximately 180 ° variable phase shifter 2.
6, and is grounded via a load resistor 27. The variable phase shifter 26 is adjusted so that the phase of the high-frequency signal input to the terminal 22 is opposite to the phase of the high-frequency signal input to the terminal 21. The load resistor 27 contributes to a stable operation with an absorbing resistor.

In the above configuration, when a signal is input only to the terminal 21, it is output to the terminal 23 via the coupler 24 as it is. When a signal is input to the terminal 23, the terminal 21 and the terminal 22 are connected via the coupler 24.
Is output to When signals are simultaneously input to the terminals 21 and 22, the level of the signal input to the terminal 22 is adjusted by the attenuator 25, and then the phase of the signal input to the variable phase shifter 26 is inverted by the variable phase shifter 26. The phases are adjusted and combined by the combining unit 24. As a result, the signal synthesized at the same level and in the opposite phase in the coupling unit 24 is greatly attenuated,
Almost no signal is output to the amplifier connection terminal 23.

Next, the configuration of the bidirectional relay amplifier 16 will be described with reference to FIG. In FIG. 3, 31 is an antenna terminal to which the parent antenna 11 is connected, and 32 is an antenna terminal to which the area antenna 12 is connected.

The high-frequency signal for the mobile station input to the antenna terminal 31 is split as a band (down frequency) for the mobile station by a band splitter composed of bandpass filters 33 and 34, and the low-noise amplifier 35 reduces the thermal noise. Is improved.

For the signal amplified by the low noise amplifier 35, a high frequency channel necessary for communication is selected through narrow band filters 36a to 36h, and power amplifiers 37a to 37h dedicated to each band are used to obtain a required power level. It is amplified until. The signals amplified by the dedicated amplifiers 37a to 37h are combined by a combiner composed of narrow band filters 38a to 38h and sent to the antenna terminal 32 without flowing backward by a band branching circuit composed of band filters 39 and 40. Can be

A signal from the mobile station 3 to the master station 1 is input to the antenna terminal 32 and is divided by the band filters 39 and 40 as a master station band (up frequency). It is separated and amplified by the low noise amplifier 41.

The signal amplified by the low-noise amplifier 41 is selected in the same manner as a signal for a mobile station by narrow-band filters 42a to 42h, and is amplified to a required power level by dedicated amplifiers 43a to 43h. This dedicated amplifier 43a ~
The signal amplified by 43h is supplied to a narrow band filter 44a.
The signals are combined by a combiner composed of .about.44h, and sent to the antenna terminal 31 without backflow by a band branching circuit composed of the band filters 33 and 34.

FIG. 4 shows the narrow band filters 36a-36.
h, 42a to 42h, and narrow band filters 38a to 38
3 shows the attenuation characteristics (solid lines) of the single components h, 44a to 44h. The broken line in FIG. 4 indicates a normal multi-stage BPF.
(Bandpass filter) shows a very gentle selectivity characteristic.

The solid line shown in FIG. 5 is a narrow band filter 36a.
To 36h, characteristics of a down-frequency amplifier in which a combiner composed of dedicated amplifiers 37a to 37h and narrow band filters 38a to 38h are combined, and narrow band filters 42a to 42h,
Dedicated amplifiers 43a-43h, narrow band filters 44a-4
4 shows characteristics of an upstream frequency amplifier in which a combiner composed of 4h is combined. Note that the broken line in FIG. 5 indicates the overall characteristics when a normal multi-stage BPF and one amplifier constitute a relay amplifier.

As is apparent from FIG. 5, the characteristics of the relay amplifier 16 shown in FIG. 3 are much steeper than the characteristics of a multistage BPF and a single amplifier. It has become.

As described above, after narrowing the required frequency band within the radio wave allocation band by using a filter having an extremely high selectivity and amplifying it, and combining the signals with filters having the same selectivity, the selectivity characteristics are doubled. In addition, amplification of unnecessary frequencies that are close to each other can be prevented.

In the relay amplifier 16 shown in detail in FIG. 3, the phases of the high-frequency waves input to two amplifying systems adjacent to the selected center frequency, for example, the narrow-band filters 36a and 36b are selected to have the same phase. By arranging them in a frequency relationship corresponding to the half value of the voltage of the attenuation characteristics, the frequency characteristics of the required band can be flattened, and the out-of-band radio waves can be greatly attenuated to prevent relaying.

Further, in the relay amplifier 16, the phase difference between the high frequencies input to the two adjacent amplification systems having the selected center frequency, for example, the high-frequency waves input to the narrow band filters 36a and 36b is selected to be 180 °, so that further unnecessary is obtained. The function of preventing the relay of radio waves can be enhanced. That is, by selecting the phase difference of the high frequencies input to the two adjacent amplification systems of the selected center frequency to 180 °, unnecessary radio waves in the frequency region where the attenuation characteristics of each amplification system are superimposed become opposite phases and become large. Decay. As a result, unnecessary relay of radio waves can be more reliably prevented. For example, when an unnecessary radio wave is present between two adjacent selected center frequencies, such a method can be used to reliably remove the unnecessary radio wave. The phase difference between high frequencies input to two adjacent amplification systems having the selected center frequency can be adjusted by the length of the cable, but may be adjusted by using a phase shifter.

[0038]

As described above in detail, according to the present invention, in a repeater for performing relay without converting a frequency in a mobile radio line of a multi-channel two-frequency duplex system, coupling between input and output is greatly reduced. As a result, abnormal oscillation can be reliably prevented.

Further, by providing an amplifying device comprising a plurality of narrow band filters, a dedicated amplifier, and a narrow band filter type synthesizer, a narrow band of a communication channel portion can be selected and relayed. The emission of unnecessary waves can be suppressed, and a wide range of communication services can be provided. In addition, mobile radio stations that use base radio stations do not need to change functions and operations, and at the same time, do not need to change the system of base radio stations to perform call communication in radio wave shielded areas such as building shadow mountain shadows. Communication can be performed or improved without allocating a new radio wave.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a multi-channel mobile radio relay device according to one embodiment of the present invention.

FIG. 2 is a configuration diagram showing details of a coupler in FIG. 1;

FIG. 3 is a block diagram showing details of a relay amplifier in the embodiment.

FIG. 4 is a diagram showing a single characteristic of a narrow band filter and a narrow band filter type combiner in a relay amplifier.

FIG. 5 is a characteristic diagram when a narrow band filter, a dedicated amplifier, and a narrow band filter type combiner in a relay amplifier are combined.

[Explanation of symbols]

 Reference Signs List 1 master station 2 relay device 3 mobile station 11 master antenna 12 area antenna 13 first sensor antenna 14 second sensor antenna 15, 17 coupler 16 relay amplifier 18 monitoring and control interface 33, 34, 39, 40 band filter 35, 41 Low noise amplifiers 36a to 36h, 42a to 42h Narrow band filters 37a to 37h, 43a to 43h Dedicated amplifiers 38a to 38h, 44a to 44h Narrow band filters

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04B 7/24-7/26 102 H04Q 7/00-7/38

Claims (4)

(57) [Claims] 1. A relay apparatus for performing relay without converting a frequency in a mobile radio circuit of a multi-channel two-frequency duplex system, comprising: a base station antenna for transmitting / receiving radio waves to / from a master station; An antenna for an area for transmitting and receiving radio waves at the antenna, a bidirectional relay amplifier provided between the parent antenna and the antenna for the area to amplify a transmission / reception signal, and a first antenna provided near the parent antenna.
And a second sensor antenna provided in proximity to the area antenna, and radiated radio waves from the area antenna and the second sensor antenna received by the parent antenna and the first sensor antenna. First coupling means for adjusting the level and combining the signals in opposite phases to couple with the relay amplifier; and radiating radio waves from the parent antenna and the first sensor antenna received by the area antenna and the second sensor antenna. 2. A multi-channel mobile radio repeater comprising: a second coupling means for level-adjusting and synthesizing in reverse phase and coupling to the relay amplifier. 2. A relay device for relaying without converting a frequency in a mobile radio line of a multi-channel two-frequency duplex system, wherein a plurality of high-frequency communication channels required for each direction of relay are separated by a plurality of narrow-band filters. Each of these separated outputs is amplified by a separate dedicated amplifier, and the output of each amplifier is combined by a narrow-band filter type combiner. A multi-channel mobile radio repeater characterized by the following. 3. A frequency characteristic of a required band is flattened by selecting an input high-frequency phase to be in phase with respect to two amplifying systems adjacent to a selected center frequency in the amplifying device. Item 3. A multi-channel mobile radio relay device according to item 2. 4. A specific unnecessary wave component existing in a pass band, wherein a phase difference between input high frequencies is set to be approximately 180 ° with respect to two adjacent amplification systems having a selected center frequency in the amplification device. 3. The multi-channel mobile radio relay apparatus according to claim 2, wherein the multi-channel mobile radio relay apparatus is removed.